diff --git a/STL_Extension/doc_tex/STL_Extension_ref/stl_extension.tex b/STL_Extension/doc_tex/STL_Extension_ref/stl_extension.tex
index 8be5a975231..e4e6e55d3ba 100644
--- a/STL_Extension/doc_tex/STL_Extension_ref/stl_extension.tex
+++ b/STL_Extension/doc_tex/STL_Extension_ref/stl_extension.tex
@@ -382,6 +382,11 @@
   \ccc{Predicate} is true. The iterator category is the same as for
   \ccc{Iterator}.
 
+  Note: Boost also provides the same functionality via the
+  \ccc{boost::filter_iterator} class.  Unfortunately, the semantics
+  chosen for accepting or rejecting elements based on the predicate's
+  result are opposite as the semantic chosen here.
+
   \ccInclude{CGAL/iterator.h}
   
   \ccRequirements